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Just to be sure, I'm already in your purestockdeodexed v2 ROM on my locked. BL XSP. I don't have to go back to 4.1.2, right? Just wiping both caches, tlashing your new ROM, the supersu fix, power off in CWM, then the. 266 kernel with flashtool would do, right? Oh, and I don't intend to.wipe my data. Do you see any problems with such strategy?

I want try this rom but do not get the third point of the procedure Of the intalation for unlocked bootloaders , Could someone clarify me that point please???
Thanks in advance.

Yeah, that seemed quite odd to me too!
What I did was this:

First I tried directly flashing this rom over the old StockDeodexed4.3 ROM of dipesh, but that didnt work out (resulted in a freeze in the recovery) so I used this procedure:

First flash a stock 12.0.A.2.254 rom with Flashtool (you can find a stock rom in the stock .FTF thread).

Then use DooMLorD's root method to root your device.*You don't need to flash back to the .254 kernel after flashing the .257 one, that only takes more time!*

Then you need to install a custom recovery (I use this one, it seems to be the best Xperia SP recovery at the moment).

After doing all that and putting the SuperSU fix and rom zipfiles on your mobile device, it is time to boot the recovery and flash the rom! (I used the stock CWM for flashing this) There is no need to mount /system or anything, just flash the rom first, and after that flash the superSU fix.

Now turn your device OFF with the recovery menu, it will warn you that this may remove the recovery. Do not worry, by flashing the .266 kernel you will need to re-install the recovery anyways.

1) Download any FTF of latest 12.1.A.0.266 firmware and place it in firmware folder of flashtool.
2) Plug-in the USB.
3) Open Flash tool and click on the lightning logo.
4) Select Flashmode.
5) Select 12.1.A.0.266 firmware on left side.
6) Uncheck kernel, fota, data, cache & appslog on right side.
7) Select Flash at bottom.
8) When asked, unplug USB and turn off phone.
9) Plug USB again while you are pressing volume down.

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